Please help me with this question
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Answer:5km/hr
Step-by-step explanation:
Attachments:
Answered by
1
Answer:
Step-by-step explanation:
take speed of stream as x kmph
given that speed of boat is 15 kmph
we also have the time and distance in our hands, and according to question going upstream [its (15-y) since stream flows downstream] and returning back downstream(15+y) to same point takes 4hrs and 30mins==>9/2hrs
so equation is 30/15+x +30/15-x = 9/2 hrs
==>30 {15-x+15+x/225-x²}=9/2 ........taking L.C.M
==>30×30×2/9=225-x²
==>100×2=225-x²
==>x²=25
==>x=±5 .......speed can't be negative so x=5 kmph
hope it helps!
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